| Value | Category | Cases | |
|---|---|---|---|
| -9 | Don't know (spontaneous) | 12 | 
                                    
                                    8.3%
                                 | 
| 1 | 3 | 
                                    
                                    2.1%
                                 | |
| 2 | 1 | 
                                    
                                    0.7%
                                 | |
| 4 | 1 | 
                                    
                                    0.7%
                                 | |
| 5 | 4 | 
                                    
                                    2.8%
                                 | |
| 6 | 1 | 
                                    
                                    0.7%
                                 | |
| 10 | 5 | 
                                    
                                    3.5%
                                 | |
| 15 | 2 | 
                                    
                                    1.4%
                                 | |
| 16 | 1 | 
                                    
                                    0.7%
                                 | |
| 20 | 11 | 
                                    
                                    7.6%
                                 | |
| 25 | 3 | 
                                    
                                    2.1%
                                 | |
| 30 | 6 | 
                                    
                                    4.2%
                                 | |
| 33 | 1 | 
                                    
                                    0.7%
                                 | |
| 34 | 1 | 
                                    
                                    0.7%
                                 | |
| 35 | 3 | 
                                    
                                    2.1%
                                 | |
| 40 | 8 | 
                                    
                                    5.6%
                                 | |
| 45 | 1 | 
                                    
                                    0.7%
                                 | |
| 50 | 33 | 
                                    
                                    22.9%
                                 | |
| 51 | 1 | 
                                    
                                    0.7%
                                 | |
| 60 | 5 | 
                                    
                                    3.5%
                                 | |
| 65 | 2 | 
                                    
                                    1.4%
                                 | |
| 70 | 6 | 
                                    
                                    4.2%
                                 | |
| 75 | 2 | 
                                    
                                    1.4%
                                 | |
| 80 | 4 | 
                                    
                                    2.8%
                                 | |
| 90 | 3 | 
                                    
                                    2.1%
                                 | |
| 100 | 24 | 
                                    
                                    16.7%
                                 | |
| Sysmiss | 71 |